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SHORT-TERM DEBT AND LINES OF CREDIT
 3 Months Ended
Mar. 31, 2024
Short-Term Debt [Abstract]  
SHORT-TERM DEBT AND LINES OF CREDIT SHORT-TERM DEBT AND LINES OF CREDIT
The following table shows our short-term borrowings and their corresponding weighted-average interest rates:
(in millions, except percentages)March 31, 2024December 31, 2023
Commercial paper
Amount outstanding$2,570.0 $2,017.2 
Weighted-average interest rate on amounts outstanding 5.50 %5.49 %
Operating expense loans
Amount outstanding (1)
$4.2 $3.7 

(1)Coyote Ridge Wind, LLC, Tatanka Ridge, and Jayhawk have entered into operating expense loans. In accordance with their limited liability company operating agreements, they received loans from the holders of their noncontrolling interests in proportion to their ownership interests.

Our average amount of commercial paper borrowings based on daily outstanding balances during the three months ended March 31, 2024 was $2,014.4 million with a weighted-average interest rate during the period of 5.48%.

The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing programs, including remaining available capacity under these facilities:
(in millions)MaturityMarch 31, 2024
WEC Energy GroupSeptember 2026$1,500.0 
WEC Energy GroupOctober 2024200.0 
WESeptember 2026500.0 
WPSSeptember 2026400.0 
WGSeptember 2026350.0 
PGLSeptember 2026350.0 
Total short-term credit capacity$3,300.0 
Less: 
Letters of credit issued inside credit facilities$2.3 
Commercial paper outstanding2,570.0 
Available capacity under existing agreements$727.7